Feather M0 Bluefruit LE

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Battery powered Feather M0 Bluefruit LE with a white LED attached (top view).

The Feather M0 Bluefruit LE is a compact board which in essence is a Feather M0 Basic Proto with an on-board Bluefruit LE SPI Friend. It's small and has a Lithium Polymer (LiPo) battery charger making it ideal for this project.

Connecting an LED

The VLL protocol requires a light source to transmit the pulses to the Micro Scout. Surprisingly, the Feather's small, on-board, red LED can be used in dim ambient light. It struggles in brighter surroundings so an external LED is a better option.

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Feather M0 Bluefruit LE with a white LED and 330ohm resistor on D6 (top view).

The diagram above and the picture below show a brighter, white LED with a 330 ohm resistor connected between D6 and GND. In this case the resistor has been soldered to the LED and the other lead has been extended a little with the offcut from the resistor. This could be done by twisting the wires together tightly for a quick, temporary, solderless prototype. The leads are bent back at the ends to double them up to make them the fit and grip the holes removing the need for soldering to the Feather.

Care needs to be taken to ensure the wires stay clear of the other connections on the Feather board. The Blu Tack used here is holding the LED in place and also keeping the wires clear above the board. A multimeter can be used to confirm that similar putty/tak products are non-conductive.

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Feather M0 Bluefruit LE with a white LED and 330ohm resistor on D6 + Father Christmas making extraterrestial deliveries (bottom view).

The white LED is showing up as blue partly due to the photograph being colour-balanced for the warm ambient light.

Be sure if you wire your LED this way, the bare wires do not touch any other copper pads on the back of the Feather.
This guide was first published on Dec 13, 2018. It was last updated on Dec 13, 2018. This page (Feather M0 Bluefruit LE) was last updated on Oct 15, 2019.